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Finding the Fourth Proportional to 394.78, 591.94 and 271.52

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Solution

The fourth proportional to 394.78, 591.94 and 271.52 is: 407.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.78 : 591.94 = 271.52 : x
  2. Step 2: Convert to fraction form
    394.78/591.94 = 271.52/x
  3. Step 3: Cross multiply
    394.78x = 591.94 × 271.52
  4. Step 4: Simplify right side
    394.78x = 160,723.55
  5. Step 5: Solve for x
    x = 160,723.55/394.78
  6. Step 6: Final answer
    x = 407.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.